474 GASTEROPODA OF THE INFERIOR OOLITE. 



lip is thickened aucl drawn out obliquely, being quite smooth and rounded at the 

 extremity. 



Belations and Distribution. — Actseonina glabra possesses the most stumpy 

 spire of all the truly cylindro-conical Adseoninse (CylindrobiiUina) . In Yorkshire 

 it occurs chiefly in the uppermost horizon of the Inferior Oolite. I have a 

 specimen in my Collection from the Dean and Chapter Pit at Lincoln {MurcMsonse- 

 zone) 22 mm. in height. On the higher horizons of the Lincolnshire Limestone at 

 Wansford and Weldon, and also at Barnack, smaller specimens like fig. 22, and 

 still smaller ones, are by no means rare. 



421. AcT^ONiNA (Cylindeobullina) ciNEEEA, Hudleston, 1885. Plate XLIII, 



figs. 1 a, 1 b. 



1885. AcT^ONiNA ciNEREA, HudUston. Geol. Mag., 1885, p. 206, pi. v, figs. 8, 8 a. 



Description : 



Height ..... 10 — 25 mm. 



Body-whorl to total height . . . 80 : 100. 



Spiral angle .... 90°. 



Shell cylindro-conical, with a regular spire about one-fifth the total height. 

 The angle of increase is exactly a right angle; apex obtuse. Whorls of the 

 spire five, short, sub-tumid, and smooth, with a well-marked posterior tabulation or 

 ledge, which is also very conspicuous on the body- whorl. Body- whorl relatively 

 large and cylindrical, sides compressed. Aperture two-thirds of the total height, 

 narrow with very straight outer lip, and rounded off anteriorly ; columella smooth. 

 More or less flexuous growth-lines are visible on some specimens. 



Belations and Distribution. — Near to Actseonina glabra, of which this may be 

 considered a broad variety with a somewhat higher spire and more distinct 

 tabulation. On the other hand, the rectangular outline of the whorls and shorter 

 spire serve to separate it from Act. Scarburgensis. Not uncommon in the Scar- 

 borough Limestone. 



422. AcTJiONiNA GiGANTEA, Deslongchamps, 1842. Plate XLIII, figs. 2 and 3, var. 



attenuata, fig. 4. 



1842. TofiNATELLA GIGANTEA, Beslotigchamps. Mem. Soc. Linn. Norm., vol. vii, 



p. 137, pi. X, fig?. 27 and 28. 



